My brother went to a technician and he said the BIOS or something had problem. He didn't ask more details about it because that time he only intended to format the laptop there. So, what is it and what does it do? The laptop now can't be turned on completely, and does it have anything to do with it?
In terms of BIOS, usually on computers a decent way in fixing a damaged BIOS is to flash the BIOS. However since this is a laptop I do not recommend it to anyone that isn't an IT major or a technician, if not then there has to be other alternatives but which can be discussed with the technician once returned.
If you are right and the BIOS was/is damaged you might have to flash the laptop in order to install a fully working one again.
If you do not know or understand what I have just said, go to the technician and ask for the budget as the BIOS is nothing to be played with. A wrongly executed flash process can permanently damage the laptop.
The BIOS is independent from the data of your hdd. It is more related to the motherboard where its settings are stored.
Still being BIOS flashing a delicated process I would recommend you to backup the hdd's content in case something goes wrong and the laptop ends up broken/non functional. Not that you necessarily would loose your data but most likely you would have to use the hdd with another laptop/computer in order to access it.
First of all, the BIOS doesn't fry itself, something must have happened. There must have been some kind of tampering or something like that. (Or some severe falling damage)
Second, if your BIOS is really 'screwed', the best thing you can do is reflash the BIOS and hope for good luck.
Third, flashing the BIOS isn't that hard. Go to the laptop's manufacturer's website, I'm sure there are several guides that'll show you how to do so. (THERE SHOULD BE.)
Fourth, look if your laptop still has warranty, you might just be in luck, you know.
Fifth, are you sure this 'technician' is trustworthy? Why don't you ask the laptop's manufacturer for help first. I wouldn't bet my money on some random and probably unqualified technician.
Sixth, it's very easy to back up your old HDD's files. Put the HDD in any other laptop (It's basically just a click mechanism for HDDs) and use an external harddrive to back up your stuff. If your pc has 2.5" brackets, you might aswell use that.
Hope this helps a bit. Sorry for the wall of text.
Thanks for the advice! So, let me make it clear; I would have zero chance of losing data of my HDD, right? It's the only thing that's important for now, because all the data have been gathered since years ago..